f
f
f
f
W
U
C
C
U
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
f
C
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
C
C
B
B
W
U
f
D
10
20
30
40
50
A
2 km
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